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all persons engaged in the business of selling tangible personal property, other than an item of tangible personal property titled or registered with an agency of this State's government, at retail in the county on the gross receipts from such sales made in the course of their business. If imposed, this tax shall only be imposed in 1/4% increments. On and after September 1, 1991, this additional tax may not be imposed on tangible personal property taxed at the 1% rate under the Retailers' Occupation Tax Act (or at the 0% rate imposed under this amendatory Act of the 102nd General Assembly). Beginning December 1, 2019, this tax is not imposed on sales of aviation fuel unless the tax revenue is expended for airport-related purposes. If the county does not have an airport-related purpose to which it dedicates aviation fuel tax revenue, then aviation fuel is excluded from the tax. The county must comply with the certification requirements for airport-related purposes under Section 2-22 of the Retailers' Occupation Tax Act. For purposes of this Section, "airport-related purposes" has the meaning ascribed in Section 6z-20.2 of the State Finance Act. This exclusion for aviation fuel only applies for so long as the revenue use requirements of 49 U.S.C. 47107(b) and 49 U.S.C. 47133 are binding on the county. The changes made to this Section by this amendatory Act of the 101st General Assembly are a denial and limitation of home rule powers and functions under subsection (g) of Section 6 of Article VII of the Illinois Constitution. SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468